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H. A. DOUGLAS.

ELECTRICAL CONNECTOR.

APPLICATION FILED NOV. 21. I917.

Patented Dec. 16, 1919.

UNITED STATES PATENT ormcn HARRY A. DOUGLAS, OF BRONSON, MICHIGAN, ASSIGNOR TO DOUGLAS & RUDD MFG. 00., 0F BRONSON, MICHIGAN, A CORPORATION OF MICHIGAN,

ELECTRICAL CONNECTOR.

Specification of Letters Patent. Patented Dec. 16, 1919.

Application filed November'21, 1917. Serial No. 203,098.

To all whom it may concern:

Be it known that I, HARRY A. Dotrems, citizen of the United States, residing at Bronson, in the county of Branch and State of Michigan,have invented a certain new acting as links that connect circuit sections.

These connectors include cylindrical shells and contact carriers assembled therewith.

It is one'object of my invention to provide an improved means for assembling such shells and carriers made of insulation formed in singlepieces or in-sections, the means which I preferably employ being of other and the shell and longitudinal movement of the carrier sections with respect to each other and the shell. I accomplish the objects of my invention by efi'ecting locking interengagement of the carrier directly with the shell. Where'the carrier is formed in sections, the longitudinal movement and rotative movement of the sections 'with respect to each other and with respect to the shell are prevented by such locking interengagement.

I will explain my inventlon more fully by reference to the accom anying drawing .Fig. 2; Fig. 2 is a sectional view on line 2-2 of Fig. 1; Fig. 3 is a side elevation of the connector minus the end contact carriers; Fig. 4: is a view inside elevation 'of the structure; Fig. 5 is a longitudinal sectional view illustrating a modified form of contact carrier at the intermediate portion of the shell, the end contact carriers being removed; Fig. 6 shows the shell and 7 contact carrier sections in readiness to be assembled, the sections of the contact carrier bein here shown in separated relation.

55 e parts are indicated by similar charfigures. The connector shown includes a cylindrical metallic shell 1 having bayonet slots 2 .and 3 at its opposite ends in which may be received the bayonet pins 4 and 5 provided upon the contact carr1ers'6 and 7. The contact carrier 6 is in the nature of a connecting plug and the contact carrier 7- is in the nature of the base of an incandescent lamp 8. When the invention is embodied in a sin 1 gle pole construction (to which the invention is not to be limited) the circuit is par tially established by way of the metallic shell 1 and the metallic sheath that surrounds the base of the lamp and which sheath is in electrical contact with the shell. One, terminal of the lamp filament is connected with the sheath of the lamp base and the other. terminal of the lamp filamentis acters, of reference throughout the difl'erent connected with the central contact 9. The

from the end of the contact barrel 11 that is adjacent the lamp and being forced into engagement with the lamp contact 9 by means of the coiled spring 13 housed within the spring barrel 11. In the form of the in vention shown in Fig. 5 there is provided the contact 14, a coiled spring 15 intervening between the contacts 12 and 14 to press them apart and respectively into engagement with the central contacts upon the plug and lamp base.

- The contact carrier at the intermediate tion of the carrier in sections, as may be formed in one p1ece as illustrated 1n F1g.-1.

In the form of the invention shown in Fig. 5 the contact carrier sections 16, 17 are outwardly bulged at their central portions, the ends of the bulges being contracted to reduce the diameters of the ends of the opening in the carrier through which the contacts 14: and 12 project. The spring 15 is disposed directly in this opening and exerts its pressure upon the heads of the contacts 12 and 14, these heads engaging the shoulders at the ends of the contact carrier that are formed by reducing the opening at the ends of the contact carrier whereby such 's rin 15 is revented from ejectin the con- P g P t g nected therewith at its ends, these keys and key slots extending longitudinally of the shell whereby rotary movementof'the carrier with respect to the shell is prevented. Each key 19 is supported by the wider shell portions 20 that constitute heads of said ke s and the means by which the keys are he d in place. Recesses 21 are formed in the mid-portions of the sides of the keys 19,

these recesses forming shoulders 22 extend-' ing transversely of the shell. The space between each pair of opposite shoulders 22 corresponds to the thickness of the peripheral portion of the carrier or'the aggregate thickness of'the peripheral portions of the assembled sections of the carrier to prevent movement of the carrier or assembled carrier sections longitudinally of the shell.

- The shell is initially in the shape shown in Fig. 6. In assembling the carrier and shell, the carrier is-moved into thezone of the recesses 21 whereafter the key portions 19, 20 of the shell are merely pressed inwardly to bring the keys 19 into the slots 18 of the carrier and to bring the shoulders 22. on the shell into 'abuttting engagement with the portion of the carrier that is disposed between these shoulders. The shoulders 22 prevent longitudinal movement of the carrier and the keys 19 prevent rotary movement of the carrier sections with respect to each other and with respect to the shell. The assembly of'the shell and carrier is simply effected, no su plemental fastening devices being require and while the invention is ofparticular utility in holding carriers in place that are made in sections, it is not to be limited in its adaptation to carriers that are formed in sections. While the direct interengagement of the shell and carrier sections illustrated holds these carrier sections in facial contact with each other, I do not wish to be limited to such close assembly of the carrier sections.

While I have herein shown and particularly described the preferred embodimentv PP H eys 19 integrally formed with anintermediate portion of the shell and each integrally conof my invention I do not wish to be limited to the precise details of construction shown as changes may readily be made without dey parting from the spirit of my invention, but having thus described my invention I claim as new and desire to secure by Letters Patprovided with a key slot inits periphery,

which slot extends longitudinally of the shell, a portion of the carrier being received between said shoulders while the portion of the key between said shoulders is received in said key slot.

2. A connector including a cylindrical shell; an inwardly depressed key integrally formed with an intermediate portion of the shell, said key having a notch formed 3 in the mid portion of a slde to form shoulders extending transversely of the shell; and a contact carrier within the shell provided with a key slot in its periphery, which slot extends longitudinally of the shell, a portion ofthe carrier being received between said shoulderswhil'e the portion of the key between said shoulders is received in said key slot.

3. A connector including a cylindrical A shell; a key'integrally formed with an intermediate portion of the shell and integrally connected at its ends with the shell, said key having a notch formed in the mid-portion of a side to form shoulders extending transversely of the shell; and a contact carrier within the shell provided with a key slot in its periphery, which slot extends longitudinally of the shell, a portion of the carrier being received between said shoulders while the portion of the key between said shoulders is received in said key slot.

4. A connector including a a cylindrical shell; a key integrally1 formed with an intermediate 'portion of t e shell, said key havin a notch formed in the mid-portion of a si e .to form shoulders extending transversely of the shell; and a contact carrier withinvthe shell provided with a key slot in its periphery, which slot extends longitudinally of the shell, a portion of the carrier being received between said' shoulders while the portion of the key between said shoulders is received in said key slot.

In witness whereof I hereunto subscribe my name this 10th day of November, A. D. 

